Prognostic and histogenetic roles of gene alteration and the expression of key potentially actionable targets in salivary duct carcinomas

Tomotaka Shimura, Yuichiro Tada, Hideaki Hirai, Daisuke Kawakita, Satoshi Kano, Kiyoaki Tsukahara, Akira Shimizu, Soichiro Takase, Yorihisa Imanishi, Hiroyuki Ozawa, Kenji Okami, Yuichiro Sato, Yukiko Sato, Chihiro Fushimi, Hideaki Takahashi, Takuro Okada, Hiroki Sato, Kuninori Otsuka, Yoshihiro Watanabe, Akihiro SakaiKoji Ebisumoto, Takafumi Togashi, Yushi Ueki, Hisayuki Ota, Mizuo Ando, Shinji Kohsaka, Toyoyuki Hanazawa, Hideaki Chazono, Yoshiyuki Kadokura, Hitome Kobayashi, Toshitaka Nagao

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


The molecular characteristics of therapeutically-relevant targets and their clinicopathological implications in salivary duct carcinomas (SDCs) are poorly understood. We investigated the gene alterations and the immunoexpression of crucial oncogenic molecules in 151 SDCs. The mutation rates that were identified, in order of frequency, were as follows: TP53, 68%; PIK3CA, 18%; H-RAS, 16%; BRAF, 4%; and AKT1, 1.5%. PIK3CA/H-RAS/BRAF mutations were more common in de novo SDC than in SDC ex-pleomorphic adenoma. Furthermore, these mutations were mutually exclusive for HER2 overexpression/amplification. TP53 mutations were frequently detected in cases with the aberrant p53 expression, and TP53 missense and truncating mutations were associated with p53-extreme positivity and negativity, respectively. DISH analysis revealed no cases of EGFR amplification. The rates of PI3K, p-Akt, and p-mTOR positivity were 34%, 22%, and 66%, respectively; PTEN loss was observed in 47% of the cases. These expressions were correlated according to the signaling axis. Cases with PI3K negativity and PTEN loss appeared to show a lower expression of androgen receptor. In the multivariate analysis, patients with SDC harboring TP53 truncating mutations showed shorter progression-free survival. Conversely, p-Akt positivity was associated with a favorable outcome. This study might provide information that leads to advances in personized therapy for SDC.

Original languageEnglish
Pages (from-to)1852-1867
Number of pages16
Issue number2
Publication statusPublished - 2018


  • H-RAS
  • PI3K/Akt signaling pathway
  • PIK3CA
  • Salivary duct carcinoma
  • TP53

ASJC Scopus subject areas

  • Oncology


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